摘要： The UPSERT command inserts rows that don’t exist and updates the rows that do exist. The Word UPSERT is a fusion of the words UPDATE and INSERT. UPSERT was officially introduced in the SQL:2003 standard.IF FOUND THEN UPDATEELSE INSERT;In SQL Server 2008, Microsoft introduces the UPSERT functiona... 阅读全文

摘要： UPSERT functionality refers to either updating table rows based on some search condition, or inserting new rows if the search condition is not satisfied. This is intuitively seen from the word UPSERT - a combination of UPDATE (needed rows are present) or INSERT (needed rows are not present).The most 阅读全文